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(11) | EP 3 518 431 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
| published in accordance with Art. 153(4) EPC |
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| (54) | METHOD AND DEVICE FOR SIGNAL TRANSMISSION |
| (57) A signal transmission method and device are provided. The method includes: determining
a codebook C being a set of matrices W; determining a matrix set Ω = {W} ∈ C from the codebook C; generating one or more layers of signals, beamforming the signals with matrixes
in the matrix set Ω, and cyclically mapping the matrixes in the matrix set Ω to different
locations of transmission resources; and transmitting the beamformed signals at the
different locations of the transmission resources. |
CROSS REFERENCE OF RELATED APPLICATION
[0001] The present application claims a priority of Chinese patent application No. 201610842889.7 filed on September 22, 2016, which is incorporated herein by reference in its entirety.
TECHNICAL FIELD
[0002] The present disclosure relates to the field of communication technologies, and in particular to a signal transmission method and a signal transmission device.
BACKGROUND
[0003] In wireless communication systems, the open-loop multiple-input multiple-output (OL-MIMO) technology is an effective technology to improve communication reliability. By using different precoding at different time/frequency transmission resources, the quality of channel state information (CSI) feedback and the strength of the transmitted signal may be improved, thereby better countering the imperfections of channels. One possible OL-MIMO scheme is to cycle a predefined set of precoding matrices at different time/frequency resources of the data transmission resources. A set of candidate precoding matrices is represented by V = {V1, V2, V3, ..., VN}, where N represents the cardinality of V, and various methods are available for cyclic mapping of precoding matrices in the V. The set of precoding matrices, as well as the mapping of precoding matrices to different time frequency resources, need to be consistent between the transmitter and receiver used for CSI feedback and data transmission.
[0004] There is no OL-MIMO scheme based on DMRS (demodulation reference signal) in the wireless communication system in the related art. LTE's TM3 supports the OL-MIMO transmission based on CRS (Cell Reference Signal), but this technology needs to be based on the CRS signals which are cell-specific, of wideband and always existing, it is therefore not a promising technology. In the future wireless communication systems, in order to avoid high transmission power consumption, the CRS signal will be reduced or completely removed. Furthermore, the OL-MIMO based on CRS cannot be used in MBSFN subframes because there is no CRS (OFDM symbols 4-14) in the data transmission region of the MBSFN subframe. In order to improve the reliability of DMRS-based transmission, it is necessary to introduce the DMRS-based OL-MIMO.
SUMMARY
[0005] A signal transmission method and a signal transmission device are provided in the present disclosure, to improve a transmission performance of a transmission channel.
[0007] A signal transmission method is provided in the present disclosure, including:
determining a codebook C, wherein the codebook C is a set of matrices W;
determining a matrix set Ω = {W} ∈ C from the codebook C;
generating one or more layers of signals, beamforming the signals with matrixes in the matrix set Ω, and cyclically mapping the matrixes in the matrix set Ω to different locations of transmission resources; and
transmitting the beamformed signals at the different locations of the transmission resources.
[0008] Optionally, each matrix W is generated by transforming a phase φ of at least one Discrete Fourier Transform DFT vector V;
a set of DFT vectors corresponding to the matrices W in the matrix set Ω constitutes a group of adjacent DFT vectors V = {V1,V2,...VN};
a set of phases corresponding to the matrices W in the matrix set Ω constitutes a set of adjacent phases Θ = {φ1,φ2,...φK};
the DFT vectors corresponding to the matrices Wmapped to adjacent transmission resources are discontinuous in V = {V1,V2,...VN}, or the phases φ corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in Θ = {φ1,φ2,....φK}.
[0009] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c;
Optionally, each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, where N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for beams in the W1, where w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the discontinuous DFT vectors for the adjacent transmission resources;
a second-stage preconding matrix W2c ={w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix.
[0010] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c;
Optionally, each W1 matrix is formed by N DFT vectors which are adjacent to each other and oriented at different angles, where N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for the DFT vectors in the W1, where w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the same or different DFT vectors for the adjacent transmission resources, where the selected DFT vectors are continuous or discontinuous when different DFT vectors are selected;
a second-stage precoding matrix W2c = {w2ck}k=1,2... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix, and a cyclic mapping manner of the w2c,1...w2c,K is: selecting discontinuous phases from the second-stage precoding matrix W2c = {w2c,k}k=1,2,....
[0012] Optionally, a degree of separation of the matrices mapped to two adjacent transmission resources is greater than a preset value.
[0013] Optionally, the degree of separation of two matrices in the W2b mapped to the two adjacent transmission resources is maximized based on a distance measurement value, the degree of separation of the two matrices in the W2b is greater than a first preset value.
[0014] Optionally, a distance between the phase transformation matrices w2c,k in the W2c mapped to the adjacent transmission resources is greater than a second preset value.
[0015] Optionally, the method further includes: transmitting indication information of a determined group of matrices which are enabled to be cyclically mapped to different transmission resources.
[0016] Optionally, the transmitting the indication information of the determined group of matrices which are enabled to be cyclically mapped to the different transmission resources includes:
transmitting the indication information of the determined group of matrices which are enabled to be cyclically mapped to the different transmission resources by a semi-static signaling or a dynamic signaling.
[0017] A signal transmission device is further provided in the present disclosure, including:
a first determining module, configured to determine a codebook C, wherein the codebook C is a set of matrices W;
a second determining module, configured to determine a matrix set Ω = {W} ∈ C from the codebook C; and
a transmission module, configured to generate one or more layers of signals, beamform the signals with matrixes in the matrix set Ω, cyclically map the matrixes in the matrix set Ω to different locations of transmission resources, and transmit the beamformed signals at the different locations of the transmission resources.
[0018] Optionally, each matrix W is generated by transforming a phase φ of at least one Discrete Fourier Transform DFT vector V;
a set of DFT vectors corresponding to the matrices W in the matrix set Ω constitutes a group of adjacent DFT vectors V = {V1,V2,...VN};
a set of phases corresponding to the matrices W in the matrix set Ω constitutes a set of adjacent phases Θ = {φ1,φ2,...φK};
the DFT vectors corresponding to the matrices Wmapped to adjacent transmission resources are discontinuous in V = {V1,V2,...VN}, or the phases φ corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in Θ = {φ1,φ2,...φK}
[0019] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c;
Optionally, each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, where N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for beams in the W1, where w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the discontinuous DFT vectors for the adjacent transmission resources;
a second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix.
[0020] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c;
Optionally, each W1 matrix is formed by N DFT vectors which are adjacent to each other and oriented at different angles, where N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for the DFT vectors in the W1, where w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the same or different DFT vectors for the adjacent transmission resources, where the selected DFT vectors are continuous or discontinuous when different DFT vectors are selected;
a second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix, and a cyclic mapping manner of the w2c,1...w2c,K is: selecting discontinuous phases from the second-stage precoding matrix W2c = {w2c,k}k=1,2,....
[0022] Optionally, a degree of separation of the matrices mapped to two adjacent transmission resources is greater than a preset value.
[0023] Optionally, the degree of separation of two matrices in the W2b mapped to the two adjacent transmission resources is maximized based on a distance measurement value, the degree of separation of the two matrices in the W2b is greater than a first preset value.
[0024] Optionally, a distance between the phase transformation matrices w2c,k in the W2c mapped to the adjacent transmission resources is greater than a second preset value.
[0025] Optionally, the transmission module is further configured to transmit indication information of a determined group of matrices which are enabled to be cyclically mapped to different transmission resources.
[0026] Optionally, the transmission module is further configured to transmit the indication information of the determined group of matrices which are enabled to be cyclically mapped to the different transmission resources by a semi-static signaling or a dynamic signaling.
[0027] A signal transmission method is further provided in the present disclosure, including:
acquiring a determined group of matrices which are enabled to be cyclically mapped to different transmission resources, where a matrix set Ω={W}∈C, a codebook C is a set of matrices W;
receiving beamformed signals transmitted at different locations of the transmission resources, where the beamformed signals are obtained by beamforming one or more layers of signals through the matrices.
[0028] Optionally, each matrix W is generated by transforming a phase φ of at least one Discrete Fourier Transform DFT vector V;
a set of DFT vectors corresponding to the matrices W in the matrix set Ω constitutes a group of adjacent DFT vectors V = {V1,V2,...VN};
a set of phases corresponding to the matrices W in the matrix set Ω constitutes a set of adjacent phases Θ = {φ1,φ2,...φK};
the DFT vectors corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in V = {V1,V2,...VN}, or the phases φ corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in Θ = {φ1,φ2,...φK}.
[0029] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c;
Optionally, each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, where N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for beams in the W1, where w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the discontinuous DFT vectors for the adjacent transmission resources;
a second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix.
[0030] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c;
Optionally, each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, where N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for the DFT vectors in the W1, where w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the same or different DFT vectors for the adjacent transmission resources, where the selected DFT vectors are continuous or discontinuous when different DFT vectors are selected;
a second-stage precoding matrix W2c = {w2ck}k=1,2... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix, and a cyclic mapping manner of the w2b,1,...w2b,K is: selecting discontinuous phases from the second-stage precoding matrix W2c = {w2c,k}k=1,2,....
[0031] A signal transmission device is further provided in the present disclosure, including:
an acquisition module, configured to acquire a determined group of matrices which are enabled to be cyclically mapped to different transmission resources, where a matrix set Ω={W}∈C, a codebook C is a set of matrices W;
a receiving module, configured to receive beamformed signals transmitted at different locations of the transmission resources, where the beamformed signals are obtained by beamforming one or more layers of signals through the matrices.
[0032] An uplink channel feedback method is further provided in the present disclosure, including:
determining, by a sending apparatus, a group of matrices which are enabled to be cyclically mapped to different transmission resources;
transmitting, by the sending apparatus, one or more layers of data coded by the matrices to a receiving apparatus;
receiving, by the sending apparatus, a feedback of channel state information CSI sent by the receiving apparatus, where the CSI includes indication information configured to indicate a selected precoding matrix.
[0033] Optionally, the method further includes: indicating, by the sending apparatus, a plurality of matrices to the receiving apparatus.
[0034] A sending apparatus is further provided in the present disclosure, including:
a determining module, configured to determine a group of matrices which are enabled to be cyclically mapped to different transmission resources;
a transmitting module, configured to transmit one or more layers of data coded by the matrices to a receiving apparatus; and
a receiving module, configured to receive a feedback of channel state information CSI sent by the receiving apparatus, where the CSI includes indication information configured to indicate a selected precoding matrix.
[0035] A uplink channel feedback method is further provided in the present disclosure, including:
receiving, by a receiving apparatus, a plurality of matrices being a group of matrices which are enabled to be cyclically mapped to different transmission resources;
generating, by the receiving apparatus, channel state information CSI including indication information configured to indicate a selected matrix; and
sending, by the receiving apparatus, the CSI to the sending apparatus.
[0036] A receiving apparatus is further provided in the present disclosure, including:
a receiving module, configured to receive a plurality of matrices being a group of matrices which are enabled to be cyclically mapped to different transmission resources;
a feedback module, configured to generate channel state information CSI including indication information configured to indicate a selected matrix; and
a sending module, configured to send the CSI to the sending apparatus.
[0037] A signal transmission device is further provided in the present disclosure, including a processor, a transceiver and a memory,
the processor is configured to read a program in the memory to:
determine a codebook C, wherein the codebook C is a set of matrices W;
determine a matrix set Ω = {W} ∈ C from the codebook C; and
generate one or more layers of signals, beamform the signals with matrixes in the matrix set Ω, cyclically map the cyclically map to different locations of transmission resources and transmit the beamformed signals at the different locations of the transmission resources;
the transceiver is configured to receive and transmit data; and
the memory is configured to store data used by the processor when performing an operation.
[0038] A signal transmission device is further provided in the present disclosure, including a processor, a transceiver and a memory,
the processor is configured to read a program in the memory to:
acquire a determined group of matrices which are enabled to be cyclically mapped to different transmission resources, where a matrix set Ω={W}∈C, a codebook C is a set of matrices W; and
receive beamformed signals transmitted at different locations of the transmission resources, where the beamformed signals are obtained by beamforming one or more layers of signals through the matrices;
the transceiver is configured to receive and transmit data; and
the memory is configured to store data used by the processor when performing an operation.
[0039] A sending apparatus is further provided in the present disclosure, including a processor, a transceiver and a memory,
the processor is configured to read a program in the memory to:
determine a group of matrices which are enabled to be cyclically mapped to different transmission resources;
transmit one or more layers of data coded by the matrices to a receiving apparatus; and
receive a feedback of channel state information CSI sent by the receiving apparatus, where the CSI includes indication information configured to indicate a selected precoding matrix;
the transceiver is configured to receive and transmit data; and
the memory is configured to store data used by the processor when performing an operation.
[0040] A receiving apparatus is further provided in the present disclosure, including a processor, a transceiver and a memory,
the processor is configured to read a program in the memory to:
receive a plurality of matrices being a group of matrices which are enabled to be cyclically mapped to different transmission resources;
generate channel state information CSI including indication information configured to indicate a selected matrix; and
send the CSI to the sending apparatus;
the transceiver is configured to receive and transmit data; and
the memory is configured to store data used by the processor when performing an operation.
The technical effect of the present disclosure at least includes:
[0041] According to the present disclosure, a group of matrices which are enabled to be cyclically mapped to different transmission resources is determined, and the beamformed signals, which are obtained by beamforming one or more layers of signals through the matrices, are transmitted at different locations of the transmission resources, thereby improving the transmission performance of the transmission channel.
BRIEF DESCRIPTION OF THE DRAWINGS
[0042]
Fig.1 is a flowchart of a signal transmission method in some embodiments of the present disclosure;
Fig.2 is a flowchart of a signal transmission method in some embodiments of the present disclosure;
Fig.3 is a flowchart of a signal transmission method at a receiving apparatus side in some embodiments of the present disclosure;
Fig.4 is a flowchart of a method at a sending apparatus side when applied to the CSI feedback; and
Fig.5 is a flowchart of a method at a receiving apparatus side when applied to the CSI feedback.
DETAILED DESCRIPTION
[0043] The present disclosure will be described hereinafter in conjunction with the drawings. Although the embodiments of the present disclosure are shown in the drawings, it should be appreciated that the embodiments shall not be used to limit the scope of the present disclosure. Instead, the embodiments are used to make those skilled in the art to better understand the present disclosure and know the scope of the present disclosure.
[0044] As shown in Fig.1, a signal transmission method is provided in some embodiments of the present disclosure, including:
Step 11: determining a codebook C, wherein the codebook C is a set of matrices W;
Step 12: determining a matrix set Ω = {W} ∈ C from the codebook C;
The codebook is of a dual-stage codebook structure or a more-than-dual-stage codebook
structure.
Step 13: generating one or more layers of signals, beamforming the signals with matrixes in the matrix set Ω, and cyclically mapping the matrixes in the matrix set Ω to different locations of transmission resources;
Step 14: transmitting the beamformed signals at the different locations of the transmission resources.
[0045] According to some embodiments of the present disclosure, a group of matrices which are enabled to be cyclically mapped to different transmission resources is determined, and the beamformed signals, which are obtained by beamforming one or more layers of signals through the matrices, are transmitted at different locations of the transmission resources, thereby improving the transmission performance of the transmission channel.
[0046] As shown in Fig.2, a signal transmission method is provided in some embodiments of the present disclosure, including:
Step 21: determining a codebook C, wherein the codebook C is a set of matrices W.
Step 22: determining a matrix set Ω = {W} ∈ C from the codebook C.
[0047] The codebook is of a dual-stage codebook structure or a more-than-dual-stage codebook structure.
[0048] Step 23: transmitting indication information of a determined group of matrices which are enabled to be cyclically mapped to different transmission resources.
[0049] Specifically, the indication information of the determined group of matrices which are enabled to be cyclically mapped to the different transmission resources is transmitted by a semi-static signaling or a dynamic signaling, and this step is optional.
[0050] Step 24: generating one or more layers of signals, beamforming the signals with matrixes in the matrix set Ω, and cyclically mapping the matrixes in the matrix set Ω to different locations of transmission resources.
[0051] Step 25: transmitting the beamformed signals at the different locations of the transmission resources.
[0052] According to some embodiments of the present disclosure, a group of matrices which are enabled to be cyclically mapped to different transmission resources is determined and then sent to the receiving apparatus, and the beamformed signals, which are obtained by beamforming one or more layers of signals through the matrices, are transmitted at different locations of the transmission resources, thereby improving the transmission performance of the transmission channel.
[0053] In some embodiments of the present disclosure, each matrix W is generated by transforming a phase φ of at least one Discrete Fourier Transform DFT vector V.
[0054] A set of DFT vectors corresponding to the matrices W in the matrix set Ω constitutes a group of adjacent DFT vectors V = {V1,V2,...VN}.
[0055] A set of phases corresponding to the matrices W in the matrix set Ω constitutes a set of adjacent phases Θ = {φ1,φ2,...φK}.
[0056] The DFT vectors corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in V = {V1,V2,...VN}, or the phases φ corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in Θ = {φ1,φ2,...φK}.
[0057] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c;
[0058] Optionally, each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, where N is a positive integer.
[0059] A second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for beams in the W1, where w2b,1,...w2b,L are beam selection matrices, L is a positive integer. A cyclic mapping manner of the w2b,l,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the discontinuous DFT vectors for the adjacent transmission resources.
[0060] A second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix.
[0061] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c.
[0062] Optionally, each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, where N is a positive integer.
[0063] A second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for the DFT vectors in the W1, where w2b,1,...w2b,L are beam selection matrices, L is a positive integer.
[0064] A cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the same or different DFT vectors for the adjacent transmission resources, where the selected DFT vectors are continuous or discontinuous when different DFT vectors are selected.
[0065] A second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix, and a cyclic mapping manner of the w2b,1,...w2b,K is: selecting discontinuous phases from the second-stage precoding matrix W2c = {w2c,k}k=1,2,....
[0068] For example, taking 4Tx/8Tx LTE codebook as an example, X1,k = {Vk,1,Vk,2,...Vk,N} represents a set of N precoding vectors when transmitting a layer of data, and each precoding vector corresponds to one beam.
1≤l≤N, where Nt is the number of transmit antenna ports, and O is the oversampling rate.
[0069] If w1,k and w1,k+1 have N/2 overlapping beams, and then the codebook W1 has
matrices, otherwise W1 has
matrices.
[0070] For the second-stage precoding matrix W2, when transmitting a layer of data, each w2b,l consists of a set of column selection vectors {e1,e2,...eN}, where ei is the ith column of IN, 1≤l ≤L.
[0071] When transmitting two layers of data,
k = 0,1,... L; each w2b,l consists of a set of column selection matrices {(e1,e1),(e2,e2),...(eN,eN)}, the columns thereof are a subset of {e1, e2, ... eN}, where ei is the ith column of IN×N, IN×N is N∗N unit array IN, 1 ≤ l ≤ L.
[0072] That is, {e1, e2, ... eN} means a continuous selection (or considered to be a continuous DFT beams) from the W1 matrix.
[0073] For the second-stage precoding matrix W2, when transmitting a layer of data, W2c = {w2c,1,...w2c,M}, where w2c,k = [1,ϕk], ϕk = exp(j2π/M∗(k-1)) where ϕk is the phase rotation vector used to combine beamforming angels at two polarization directions, j is a constant, where 1 ≤ k ≤ M. In the LTH codebook, in some scenarios ϕk = {0, 1/2, 1, 3/2}π.
[0074] When transmitting two layers of data, W2 = {w2c,k}k=1,2,..., which is
or w2c,k is in the form of (ei ej), where 1≤i≤N,1≤j≤N,i≠j.
[0075] When N=4, ϕk = {0, 1/2, 1, 3/2}π, the column selection matrix of W2c may be one of the following matrices: {(e1 e1),(e2 e2),(e3 e3),(e4 e4)}, that is, the two layers of data use the same DFT beamforming vector, the phase rotation codebook W2c = {w2c,k}k=1,2,..., which may be written as
where ϕk = {0, 1/2, 1, 3/2}π.
[0076] The matrix in W2c may also be in the form of (ei ej), 1≤i≤N,1≤j≤N,i ≠ j, that is, the two layers of data select different DFT beams.
[0077] In addition, in some embodiments, a degree of separation of the matrices mapped to two adjacent transmission resources is greater than a preset value.
[0078] Specifically, the degree of separation of two matrices in the W2b mapped to the two adjacent transmission resources is maximized based on a distance measurement value, the degree of separation of the two matrices in the W2b is greater than a first preset value.
[0079] The degree of separation of the two matrices in the W2b is greater than the first preset value.
[0080] The distance measurement value may be an Euclidean distance, or a Chebychev distance, or other possible distance measurement values.
[0081] A distance between the phase transformation matrices w2c,k in the W2c mapped to the adjacent transmission resources is greater than a second preset value
Specifically, the precoding cycle in the present disclosure is not limited to the set {(e1,e1),(e2,e2),...(eN,eN)}.
[0082] For rank-1, a cycle of the precoding based on the beam selection codebook W2b = {w2b,1,...w2b,L} is designed to select a discontinuous or non-sequential DFT beams from the matrix of wl for the precoding of adjacent time/frequency resources.
[0083] Specifically, in some embodiments of the present disclosure, the degree of separation of two matrices in the W2b mapped to two adjacent time/frequency resources is maximized base on a single or multiplex distance measurement values.
[0084] This distance measurement value may be an Euclidean distance, or a Chebychev distance, or other possible distance measurement values.
[0085] The purpose of such mapping is to obtain a maximal diversity gain by maximizing the difference of the equivalent precoding channels of two adjacent time/frequency resources.
[0086] This is because the wireless propagation channel is continuous, and the closer the two time/frequency resources are, the more relevant they are. The greater the degree of separation of the precoding matrices mapped to two adjacent time/frequency resources (i.e., the greater the distance is), the more possible the receiving apparatus eliminates the channel deep fading and the receive performance is more robust.
[0087] In some embodiments of the present disclosure, assuming W2b = {e1,e2,e3,e4}, the cycle of W is designed to map to adjacent time/frequency resources through the following W2b matrix:
In some embodiments of the present disclosure, {el, e3, e2, e4} are mapped to four continuous time/frequency resources.
[0088] In some embodiments of the present disclosure, {el, e4, e2, e3} are mapped to four continuous time/frequency resources.
[0089] Similarly, for rank-2, a cycle of the precoding based on the codebook W2b = {w2b,1,...w2b,L} is designed to increase (or maximize) a distance of two precoding matrices mapped to adjacent time/frequency resources.
[0090] In some embodiments of the present disclosure, W2b = {(e1,e1),(e2,e2),(e3,e3),(e4,e4)} The cycle of W is designed to map to four precoding matrices for the cycle of the corresponding W2b = {(e1,e1),(e2,e2),(e3,e3),(e4,e4)} through the following manners.
[0091] In some embodiments of the present disclosure, {(e1, e1), (e3, e3), (e2, e2), (e4, e4)} are mapped to four adjacent time/frequency resources.
[0092] In some embodiments of the present disclosure, {(e1, e1), (e4, e4), (e2, e2), (e3, e3)} are mapped to four adjacent time/frequency resources.
[0093] Accordingly, the set W2c of co-phasing matrices may be represented as W2c = {w2c,1,...w2c,M}.
[0094] By the same token, the mapping of the co-phasing matrices in W2c should ensure that the distance between the precoding matrices mapped to adjacent time/frequency resources is as large as possible.
[0096] In some embodiments of the present disclosure, M=4, and ϕm = {0, 1, ½, 3/2} are mapped to adjacent time/frequency resources.
[0097] For rank-2, W2c = {w2c,k}k=1,2,..., which is
or w2c,k is in the form of (ei ej), where 1≤i≤N,1≤j≤N,i ≠ j.
[0098] Some more detailed embodiments are provided below. Without loss of generality, the 8Tx (8-port) LTE dual-stage codebook structure is taken as an example.
[0099] In some embodiments of the present disclosure, an LTE 8Tx is of a dual-stage codebook structure.
[0100] For 8Tx, the codebook for rank-1 is:
| i1 | i2 | |||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |
| 0 - 15 | ||||||||
| i1 | i2 | |||||||
| 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | |
| 0 - 15 | ||||||||
| where | ||||||||
[0101] The codebook for rank-2 is:
| i1 | i2 | |||
| 0 | 1 | 2 | 3 | |
| 0 - 15 | ||||
| i1 | i2 | |||
| 4 | 5 | 6 | 7 | |
| 0 - 15 | ||||
| i1 | i2 | |||
| 8 | 9 | 10 | 11 | |
| 0 - 15 | ||||
| i1 | i2 | |||
| 12 | 13 | 14 | 15 | |
| 0 - 15 | ||||
| where | ||||
For rank-1:
[0103] i2 = 0, 1, 2, 3 corresponds to the first beam of W1 (i.e., e1);
i2=4, 5, 6, 7 corresponds to the second beam of W1 (i.e., e2);
i2=8, 9, 10, 11 corresponds to the third beam of W1 (i.e., e3);
i2=12, 13, 14, 15 corresponds to the fourth beam of W1 (i.e., e4).
For rank-2:
[0104] i2 = 0, 1 corresponds to the beam pair (e1, e1);
i2=2, 3 corresponds to the beam pair (e2, e2);
i2=4, 5 corresponds to the beam pair (e3, e3);
i2=6, 7 corresponds to the beam pair (e4, e4);
i2=8, 9 corresponds to the beam pair (e1, e2);
i2=10, 11 corresponds to the beam pair (e2, e3);
i2=12, 13 corresponds to the beam pair (e1, e4);
i2=14, 15 corresponds to the beam pair (e2, e4).
[0105] The method in the above embodiments is to maximize the distance of the cyclic precoding matrix.
[0106] For rank-1, if the beam selection matrix (w2b) of the precoding matrix cycle uses the order of {el, e4, e2, e3}, co-phasing uses ϕm = {0, 1, ½, 3/2}pi, then the cycle of W2(i2) uses an order of {0, 2, 1, 3, 12, 14, 13, 15, 4, 6, 5, 7, 8, 10, 9, 11}, or
if the beam selection matrix (w2b) of the precoding matrix cycle uses the order of {el, e3, e2, e4}, co-phasing uses ϕm = {0, 1, ½, 3/2}pi, then the cycle of W2(i2) uses an order of {0, 2, 1, 3, 8, 10, 9, 11, 4, 6, 5, 7, 12, 14, 13, 15}.
[0107] For rank-2, it is assumed that the cycle is applied to the W2 matrix corresponding to (e1, e1), (e2, e2), (e3, e3), (e4, e4). If the cycle of W2 uses the order of {(e1, e1), (e4, e4), (e2, e2), (e3, e3)} for the beam selection, co-phasing uses ϕm = {0, 1} pi, and then the loop of W2(i2) uses an order of {0, 1, 6, 7, 2, 3, 4, 5}.
[0108] According to some embodiments of the present disclosure, a group of matrices which are enabled to be cyclically mapped to different transmission resources is determined, and the beamformed signals, which are obtained by beamforming one or more layers of signals through the matrices, are transmitted at different locations of the transmission resources, thereby improving the transmission performance of the transmission channel.
[0109] A signal transmission device is further provided in some embodiments of the present disclosure, including:
a first determining module, configured to determine a codebook C, wherein the codebook C is a set of matrices W;
a second determining module, configured to determine a matrix set Ω = {W} ∈ C from the codebook C; and
a transmission module, configured to generate one or more layers of signals, beamform the signals with matrixes in the matrix set Ω, cyclically map the matrixes in the matrix set Ω to different locations of transmission resources, and transmit the beamformed signals at the different locations of the transmission resources;
[0110] Optionally, each matrix W is generated by transforming a phase φ of at least one Discrete Fourier Transform DFT vector V;
a set of DFT vectors corresponding to the matrices W in the matrix set Ω constitutes a group of adjacent DFT vectors V = {V1,V2,...VN};
a set of phases corresponding to the matrices W in the matrix set Ω constitutes a set of adjacent phases Θ = {φ1,φ2,...φK};
the DFT vectors corresponding to the matrices Wmapped to adjacent transmission resources are discontinuous in V = {V1,V2,...VN}, or the phases φ corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in Θ = {φ1, φ2,....φK}.
[0111] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c;
Optionally, each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, where N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for beams in the W1, where w2b,l,...w2b,L are beam selection matrices, L is a positive integer; a cyclic mapping manner of the w2b,l,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the discontinuous DFT vectors for the adjacent transmission resources;
a second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix.
[0112] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c;
[0113] Optionally, each W1 matrix is formed by N DFT vectors which are adjacent to each other and oriented at different angles, where N is a positive integer;
a second-stage precoding matrix W2b = {w2b,l,...w2b,L} is configured to perform a selection for the DFT vectors in the W1, where w2b,l,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,l,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the same or different DFT vectors for the adjacent transmission resources, where the selected DFT vectors are continuous or discontinuous when different DFT vectors are selected;
a second-stage precoding matrix W2c = {w2ck}k=1,2... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix, and a cyclic mapping manner of the w2c,1,...w2c,K is: selecting discontinuous phases from the second-stage precoding matrix W2c = {w2c,k}k=1,2,....
[0115] Optionally, a degree of separation of the matrices mapped to two adjacent transmission resources is greater than a preset value.
[0116] Optionally, the degree of separation of two matrices in the W2b mapped to the two adjacent transmission resources is maximized based on a distance measurement value, the degree of separation of the two matrices in the W2b is greater than a first preset value.
[0117] Optionally, a distance between the phase transformation matrices w2c,k in the W2c mapped to the adjacent transmission resources is greater than a second preset value.
[0118] Optionally, the transmission module is further configured to transmit indication information of a determined group of matrices which are enabled to be cyclically mapped to different transmission resources.
[0119] Optionally, the transmission module is further configured to transmit the indication information of the determined group of matrices which are enabled to be cyclically mapped to the different transmission resources by a semi-static signaling or a dynamic signaling.
[0120] It should be noted that the device is a device corresponding to the above method, and all embodiments in the above method are applicable to the embodiments of the device, and the same technical effects may be achieved.
[0121] A sending apparatus is further provided in some embodiments of the present disclosure, including: a processor, a memory connected to the processor through a bus interface, and a transceiver connected to the processor through a bus interface. The memory is used for storing the program and data used by the processor when performing the operation. The processor is configured to implement the following functional modules:
a first determining module, configured to determine a codebook C, wherein the codebook C is a set of matrices W;
a second determining module, configured to determine a matrix set Ω = {W} ∈ C from the codebook C; and
a transmission module, configured to generate one or more layers of signals, beamform the signals with matrixes in the matrix set Ω, cyclically map the matrixes in the matrix set Ω to different locations of transmission resources, and transmit the beamformed signals at the different locations of the transmission resources.
[0122] In the sending apparatus in some embodiments of the present disclosure, the bus interface may be an interface in a bus architecture, and the bus architecture may include any number of interconnected buses and bridges. To be specific, one or more processors represented by the processor and memory represented by the memory are linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators and power management circuits. The bus interface provides interfaces. The processor is responsible for managing the bus architecture and the usual processing. The memory may store the data that processor uses when performing operations.
[0123] The disclosed methods are applicable to the downlink (e.g., from the network to the mobile terminal) and the uplink (e.g., from the mobile terminal to the network). The "data" in the above statement may be any digital information bits including, but not limited to, user plane data and/or control plane data (carrying control information transmitted to or from a certain UE or group of UEs).
[0124] As shown in Fig.3, a signal transmission method at a receiving apparatus side corresponding to the above method includes:
Step 31: acuiring a determined group of matrices which are enabled to be cyclically mapped to different transmission resources, where a matrix set Ω={W}∈C, a codebook C is a set of matrices W;
Step 32: receiving beamformed signals transmitted at different locations of the transmission resources, where the beamformed signals are obtained by beamforming one or more layers of signals through the matrices.
[0125] Optionally, each matrix W is generated by transforming a phase φ of at least one Discrete Fourier Transform DFT vector V;
a set of DFT vectors corresponding to the matrices W in the matrix set Ω constitutes a group of adjacent DFT vectors V = {V1,V2,...VN};
a set of phases corresponding to the matrices W in the matrix set Ω constitutes a set of adjacent phases Θ = {φ1,φ2,...φK};
the DFT vectors corresponding to the matrices Wmapped to adjacent transmission resources are discontinuous in V = {V1,V2,...VN}, or the phases φ corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in Θ = {φ1,φ2....φK}.
[0126] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c.
[0127] Optionally, each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, where N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for beams in the W1, where w2b,l,...w2b,L are beam selection matrices, L is a positive integer; a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the discontinuous DFT vectors for the adjacent transmission resources;
a second-stage precoding matrix W2c = {w2ck}k=1,2... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix.
[0128] Optionally, the codebook C is of a dual-stage codebook structure, and in the codebook C, the matrices W = W1W2 = W1W2bW2c;
Optionally, each W1 matrix is formed by N DFT vectors which are adjacent to each other and oriented at different angles, where N is a positive integer;
a second-stage precoding matrix W2b = {w2b,l,...w2b,L} is configured to perform a selection for the DFT vectors in the W1, where w2b,l,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,l,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the same or different DFT vectors for the adjacent transmission resources, where the selected DFT vectors are continuous or discontinuous when different DFT vectors are selected;
a second-stage precoding matrix W2c = {w2ck}k=1,2... is configured to perform phase rotations for the beams in the W1, where w2c,k is a phase transformation matrix, and a cyclic mapping manner of the w2c,1...w2c,K is: selecting discontinuous phases from the second-stage precoding matrix W2c = {w2c,k}k=1,2,....
[0129] Furthermore, all the examples of the matrix in the foregoing method embodiments are applicable to the embodiment of the method of the receiving apparatus, and the same technical effects may be achieved.
[0130] Corresponding to the method of the receiving apparatus, a signal transmission device is further provided in some embodiments of present disclosure, including:
an acquisition module, configured to acquire a determined group of matrices which are enabled to be cyclically mapped to different transmission resources, where a matrix set Ω={W}∈C, a codebook C is a set of matrices W;
a receiving module, configured to receive beamformed signals transmitted at different locations of the transmission resources, where the beamformed signals are obtained by beamforming one or more layers of signals through the matrices. It should be noted that all the examples of the precoding matrix in the foregoing method embodiments are applicable to the embodiment of the method of the receiving apparatus, and the same technical effects may be achieved.
[0131] As shown in Fig.4, when applied to CSI feedback, the method at the sending apparatus side includes:
Step 41: determining, by a sending apparatus, a group of matrices which are enabled to be cyclically mapped to different transmission resources;
Step 42: transmitting, by the sending apparatus, one or more layers of data coded by the matrices to a receiving apparatus;
Step 43: indicating by the sending apparatus multiple precoding matrices to the receiving apparatus, which may be configured through a RRC signaling, and this step is optional;
Step 44: receiving, by the sending apparatus, a feedback of channel state information CSI sent by the receiving apparatus, where the CSI includes indication information configured to indicate a selected precoding matrix. This method is also applicable to DMRS transmissions.
[0132] A sending apparatus is further provided in some embodiments of the present disclosure, including:
a determining module, configured to determine a group of matrices which are enabled to be cyclically mapped to different transmission resources;
a transmitting module, configured to transmit one or more layers of data coded by the matrices to a receiving apparatus; and
a receiving module, configured to receive a feedback of channel state information CSI sent by the receiving apparatus, where the CSI includes indication information configured to indicate a selected precoding matrix.
[0133] As shown in Fig.5, when applied to CSI feedback, the method at the receiving apparatus side includes:
Step 51: receiving, by a receiving apparatus and through a RRC signaling, a plurality of precoding matrices being a group of precoding matrices which are enabled to be cyclically mapped to different transmission resources;
Step 52: generating, by the receiving apparatus, channel state information CSI including indication information configured to indicate a selected matrix;
Step 53: sending, by the receiving apparatus, the CSI to the sending apparatus.
[0135] A receiving apparatus is further provided in some embodiments of the present disclosure, including:
a receiving module, configured to receive a plurality of matrices being a group of matrices which are enabled to be cyclically mapped to different transmission resources;
a feedback module, configured to generate channel state information CSI including indication information configured to indicate a selected matrix; and
a sending module, configured to send the CSI to the sending apparatus.
[0136] A receiving apparatus is further provided in some embodiments of the present disclosure, including:
a processor, a memory coupled to the processor via a bus interface, and a transceiver coupled to the processor via a bus interface, where the memory is configured to store programs and data used by the processor when performing operations, and the processor implements the following functions:
receiving an indication of the transmitter, where the indication carries a group of precoding matrices which are enabled to be cyclically mapped to different transmission resources; it should be noted that this step is optional; receiving one or more layers of data which may be coded by a group of precoding matrices which are enabled to be cyclically mapped to different transmission resources.
[0137] Here, the group of precoding matrices which are enabled to be cyclically mapped to different transmission resources may be mapped according to the methods described in some embodiments of the present disclosure.
[0138] In the receiving apparatus in some embodiments of the present disclosure, the bus interface may be an interface in a bus architecture, and the bus architecture may include any number of interconnected buses and bridges. To be specific, one or more processors represented by the processor and memory represented by the memory are linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators and power management circuits. The bus interface provides interfaces. The processor is responsible for managing the bus architecture and the usual processing. The memory may store the data that processor uses when performing operations.
[0139] The sending apparatus in some embodiments of the present disclosure may be a base station, or may be a transmitter of the base station, and the receiving apparatus may be a terminal or a receiver of the terminal. Of course, the sending apparatus may also be a terminal or a transmitter of a terminal. The receiving apparatus may also be a base station or a receiver of a base station.
[0140] The purpose of the design of the precoding matrix cycle under MIMO communication is to map non-contiguous/non-sequential beams on adjacent time/frequency resources. Specifically, a distance between precoding matrices mapped to adjacent time/frequency resources is maximized based on a particular distance measurement value and through non-continuous/non-sequential beams. In the non-ideal communication channel conditions, the robustness of the system is improved, so as to solve the attenuation of the channel amplitude.
[0141] The present disclosure has been described with reference to the flow charts and/or block diagrams of the method, device (system) and computer program product according to the embodiments of the present disclosure. It should be understood that computer program instructions may be used to implement each of the work flows and/or blocks in the flow charts and/or the block diagrams, and the combination of the work flows and/or blocks in the flow charts and/or the block diagrams. These computer program instructions may be provided to a processor of a common computer, a dedicate computer, an embedded processor or any other programmable data processing devices to create a machine, so that instructions executable by the processor of the computer or the other programmable data processing devices may create a device to achieve the functions assigned in one or more work flows in the flow chart and/or one or more blocks in the block diagram.
[0142] These computer program instructions may also be stored in a computer readable storage that may guide the computer or the other programmable data process devices to function in a certain way, so that the instructions stored in the computer readable storage may create a product including an instruction unit which achieves the functions assigned in one or more flows in the flow chart and/or one or more blocks in the block diagram.
[0143] These computer program instructions may also be loaded in the computer or the other programmable data process devices, so that a series of operation steps are executed on the computer or the other programmable devices to create processes achieved by the computer. Therefore, the instructions executed in the computer or the other programmable devices provide the steps for achieving the function assigned in one or more flows in the flow chart and/or one or more blocks in the block diagram.
[0144] The above are merely some embodiments of the present disclosure. A person skilled in the art may make further modifications and improvements without departing from the principle of the present disclosure, and these modifications and improvements shall also fall within the scope of the present disclosure.
determining a codebook C, wherein the codebook C is a set of matrices W;
determining a matrix set Ω = {W} ∈ C from the codebook C;
generating one or more layers of signals, beamforming the signals with matrixes in the matrix set Ω, and cyclically mapping the matrixes in the matrix set Ω to different locations of transmission resources; and
transmitting the beamformed signals at the different locations of the transmission resources.
a set of DFT vectors corresponding to the matrices W in the matrix set Ω constitutes a group of adjacent DFT vectors V = {V1,V2,...VN};
a set of phases corresponding to the matrices W in the matrix set Ω constitutes a set of adjacent phases Θ = {φ1,φ2,...φK};
the DFT vectors corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in V = {V1,V2,...VN}, or the phases φ corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in Θ = {φ1,φ2,...φK}.
wherein each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, wherein N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for beams in the W1, wherein w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the discontinuous DFT vectors for the adjacent transmission resources;
a second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, wherein w2c,k is a phase transformation matrix.
wherein each W1 matrix is formed by N DFT vectors which are adjacent to each other and oriented at different angles, wherein N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for the DFT vectors in the W1, wherein w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the same or different DFT vectors for the adjacent transmission resources, wherein the selected DFT vectors are continuous or discontinuous when different DFT vectors are selected;
a second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, wherein w2c,k is a phase transformation matrix, and a cyclic mapping manner of the w2c,1,...w2c,K is: selecting discontinuous phases from the second-stage precoding matrix W2c = {w2c,k}k=1,2,....
transmitting the indication information of the determined group of matrices which are enabled to be cyclically mapped to the different transmission resources by a semi-static signaling or a dynamic signaling.
a first determining module, configured to determine a codebook C, wherein the codebook C is a set of matrices W;
a second determining module, configured to determine a matrix set Ω = {W} ∈ C from the codebook C; and
a transmission module, configured to generate one or more layers of signals, beamform the signals with matrixes in the matrix set Ω, cyclically map the matrixes in the matrix set Ω to different locations of transmission resources, and transmit the beamformed signals at the different locations of the transmission resources.
a set of DFT vectors corresponding to the matrices W in the matrix set Ω constitutes a group of adjacent DFT vectors V = {V1,V2,...VN};
a set of phases corresponding to the matrices W in the matrix set Ω constitutes a set of adjacent phases Θ = {φ1,φ2,...φK};
the DFT vectors corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in V = {V1,V2,...VN}, or the phases φ corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in Θ = {φ1,φ2,...φK}.
wherein each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, wherein N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for beams in the W1, wherein w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the discontinuous DFT vectors for the adjacent transmission resources;
a second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, wherein w2c,k is a phase transformation matrix.
wherein each W1 matrix is formed by N DFT vectors which are adjacent to each other and oriented at different angles, wherein N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for the DFT vectors in the W1, wherein w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the same or different DFT vectors for the adjacent transmission resources, wherein the selected DFT vectors are continuous or discontinuous when different DFT vectors are selected;
a second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, wherein w2c,k is a phase transformation matrix, and a cyclic mapping manner of the w2c,1,...w2c,K is: selecting discontinuous phases from the second-stage precoding matrix W2c = {w2c,k}k=1,2,....
acquiring a determined group of matrices which are enabled to be cyclically mapped to different transmission resources, wherein a matrix set Ω={W}∈C, a codebook C is a set of matrices W;
receiving beamformed signals transmitted at different locations of the transmission resources, wherein the beamformed signals are obtained by beamforming one or more layers of signals through the matrices.
a set of DFT vectors corresponding to the matrices W in the matrix set Ω constitutes a group of adjacent DFT vectors V = {V1,V2,...VN};
a set of phases corresponding to the matrices W in the matrix set Ω constitutes a set of adjacent phases Θ = {φ1,φ2,...φK};
the DFT vectors corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in V = {V1,V2,...VN}, or the phases φ corresponding to the matrices W mapped to adjacent transmission resources are discontinuous in Θ = {φ1,φ2,...φK}.
wherein each W1 matrix is formed by N DFT beams which are adjacent to each other and oriented at different angles, wherein N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for beams in the W1, wherein w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the discontinuous DFT vectors for the adjacent transmission resources;
a second-stage precoding matrix W2c = {w2ck}k=1,2... is configured to perform phase rotations for the beams in the W1, wherein w2c,k is a phase transformation matrix.
wherein each W1 matrix is formed by N DFT vectors which are adjacent to each other and oriented at different angles, wherein N is a positive integer;
a second-stage precoding matrix W2b = {w2b,1,...w2b,L} is configured to perform a selection for the DFT vectors in the W1, wherein w2b,1,...w2b,L are beam selection matrices, L is a positive integer;
a cyclic mapping manner of the w2b,1,...w2b,L is: selecting, from the matrices in the W1, the matrices corresponding to the same or different DFT vectors for the adjacent transmission resources, wherein the selected DFT vectors are continuous or discontinuous when different DFT vectors are selected;
a second-stage precoding matrix W2c = {w2c,k}k=1,2,... is configured to perform phase rotations for the beams in the W1, wherein w2c,k is a phase transformation matrix, and a cyclic mapping manner of the w2c,1,...w2c,K is: selecting discontinuous phases from the second-stage precoding matrix W2c = {W2c,k}k=1,2,....
an acquisition module, configured to acquire a determined group of matrices which are enabled to be cyclically mapped to different transmission resources, wherein a matrix set Ω={W}∈C, a codebook C is a set of matrices W;
a receiving module, configured to receive beamformed signals transmitted at different locations of the transmission resources, wherein the beamformed signals are obtained by beamforming one or more layers of signals through the matrices.
determining, by a sending apparatus, a group of matrices which are enabled to be cyclically mapped to different transmission resources;
transmitting, by the sending apparatus, one or more layers of data coded by the matrices to a receiving apparatus;
receiving, by the sending apparatus, a feedback of channel state information CSI sent by the receiving apparatus, wherein the CSI comprises indication information configured to indicate a selected precoding matrix.
a determining module, configured to determine a group of matrices which are enabled to be cyclically mapped to different transmission resources;
a transmitting module, configured to transmit one or more layers of data coded by the matrices to a receiving apparatus; and
a receiving module, configured to receive a feedback of channel state information CSI sent by the receiving apparatus, wherein the CSI comprises indication information configured to indicate a selected precoding matrix.
receiving, by a receiving apparatus, a plurality of matrices being a group of matrices which are enabled to be cyclically mapped to different transmission resources;
generating, by the receiving apparatus, channel state information CSI comprising indication information configured to indicate a selected matrix; and
sending, by the receiving apparatus, the CSI to the sending apparatus.
a receiving module, configured to receive a plurality of matrices being a group of matrices which are enabled to be cyclically mapped to different transmission resources;
a feedback module, configured to generate channel state information CSI comprising indication information configured to indicate a selected matrix; and
a sending module, configured to send the CSI to the sending apparatus.
determine a codebook C, wherein the codebook C is a set of matrices W;
determine a matrix set Ω = {W} ∈ C from the codebook C; and
generate one or more layers of signals, beamform the signals with matrixes in the matrix set Ω, cyclically map the matrixes in the matrix set Ω to different locations of transmission resources and transmit the beamformed signals at the different locations of the transmission resources;
the transceiver is configured to receive and transmit data; and
the memory is configured to store data used by the processor when performing an operation.
acquire a determined group of matrices which are enabled to be cyclically mapped to different transmission resources, wherein a matrix set Ω={W}∈C, a codebook C is a set of matrices W; and
receive beamformed signals transmitted at different locations of the transmission resources, wherein the beamformed signals are obtained by beamforming one or more layers of signals through the matrices;
the transceiver is configured to receive and transmit data; and
the memory is configured to store data used by the processor when performing an operation.
determine a group of matrices which are enabled to be cyclically mapped to different transmission resources;
transmit one or more layers of data coded by the matrices to a receiving apparatus; and
receive a feedback of channel state information CSI sent by the receiving apparatus, wherein the CSI comprises indication information configured to indicate a selected precoding matrix;
the transceiver is configured to receive and transmit data; and
the memory is configured to store data used by the processor when performing an operation.
receive a plurality of matrices being a group of matrices which are enabled to be cyclically mapped to different transmission resources;
generate channel state information CSI comprising indication information configured to indicate a selected matrix; and
send the CSI to the sending apparatus;
the transceiver is configured to receive and transmit data; and
the memory is configured to store data used by the processor when performing an operation.
REFERENCES CITED IN THE DESCRIPTION
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Patent documents cited in the description